Aron(ココドラ) is the 70th Pokémon in the Hoenn Pokédex. It is a Steel/Rock Type, and it is known as the Iron Armor Pokémon.

Aron can have one of two abilities: Sturdy, which nullifies the effect of one-hit KO moves on it, and starting with Generation V, prevents it from being Knocked Out in one hit--if its HP is full, an attack that would have caused a KO will leave it with 1 HP; or Rock Head, which nullifies recoil from moves such as Double-Edge or Head Smash. Aron from the Dream World have access to a third Ability, the Heavy Metal Ability. This ability doubles its weight in battle, affecting how much damage it would take from Grass Knot or Low Kick as well as how much damage it can deal out from the attack Heavy Slam.

Aron gains the opportuinty to evolve into a Lairon starting at Level 32. It can evolve into the ferocious Aggron starting at Level 42.

Aron is in the Monster Egg Group, and its Egg takes approximately 8,960 Steps to hatch. It takes Aron 1,250,000 Experience Points to reach Level 100.

Aron appears at Fuego Ironworks with the use of Poké Radar in Diamond and Platinum. Aron appears at the Safari Zone's Rocky Beach area in Heart Gold and Soul Silver after 24 Peak Objects are placed in that area. It will then start appearing in that area--no waiting in terms of days is required.

Aron appears in Pokémon Ranger: Shadows of Almia at Peril Cliff. Aron returns in Pokémon Ranger: Guardian Signs on the fourth and fifth floors of the Wireless Base on Rainbow Island in the Present; and the Fire Temple mission "Shaken by Aggron's Footsteps" by capturing it or one of its evolved forms and obtaining its Slate, but the slate can only be kept if the Boss is defeated within the time limit.